Question 511766
The surface area of 1/2 a cylinder is 1/2* surface area of the whole cylinder.
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L = the length of the cylinder = 5
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D = diameter = 4
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Surface area = circumference * L
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Surface area = diameter * pi * L
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Surface area = 4 * pi * 5 = 20 pi
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1/2 surface area = 1/2 * 20 pi = 10 pi
.
Done.